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Fair Value - Assets and Liabilities Recorded at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Assets    
Total available-for-sale securities, Fair value, $ 3,967,746 $ 8,428,032
Collateralized Loan Obligations    
Assets    
Total available-for-sale securities, Fair value, 246,703 105,247
Fair Value, Measurements, Recurring    
Assets    
Total available-for-sale securities, Fair value, 3,967,746 8,428,032
Other assets 17,089 58,307
Liabilities    
Other liabilities (31,647) (6,768)
Total    
Net Assets (Liabilities) 3,953,188 8,479,571
Fair Value, Measurements, Recurring | Level 1    
Assets    
Other assets 6,703 7,382
Total    
Net Assets (Liabilities) 6,703 7,382
Fair Value, Measurements, Recurring | Level 2    
Assets    
Total available-for-sale securities, Fair value, 3,967,746 8,428,032
Other assets 10,386 50,925
Liabilities    
Other liabilities (27,861) (1,238)
Total    
Net Assets (Liabilities) 3,950,271 8,477,719
Fair Value, Measurements, Recurring | Level 3    
Liabilities    
Other liabilities (3,786) (5,530)
Total    
Net Assets (Liabilities) (3,786) (5,530)
U.S. Treasury and government agency debt securities    
Assets    
Total available-for-sale securities, Fair value, 159,165 192,563
U.S. Treasury and government agency debt securities | Fair Value, Measurements, Recurring    
Assets    
Total available-for-sale securities, Fair value, 159,165 192,563
U.S. Treasury and government agency debt securities | Fair Value, Measurements, Recurring | Level 2    
Assets    
Total available-for-sale securities, Fair value, 159,165 192,563
Government-sponsored enterprises debt securities    
Assets    
Total available-for-sale securities, Fair value, 19,963  
Government-sponsored enterprises debt securities | Fair Value, Measurements, Recurring    
Assets    
Total available-for-sale securities, Fair value, 19,963  
Government-sponsored enterprises debt securities | Fair Value, Measurements, Recurring | Level 2    
Assets    
Total available-for-sale securities, Fair value, 19,963  
Residential - Government agency    
Assets    
Total available-for-sale securities, Fair value, 67,958 137,264
Residential - Government agency | Fair Value, Measurements, Recurring    
Assets    
Total available-for-sale securities, Fair value, 67,958 137,264
Residential - Government agency | Fair Value, Measurements, Recurring | Level 2    
Assets    
Total available-for-sale securities, Fair value, 67,958 137,264
Residential - Government-sponsored enterprises    
Assets    
Total available-for-sale securities, Fair value, 1,333,015 1,491,100
Residential - Government-sponsored enterprises | Fair Value, Measurements, Recurring    
Assets    
Total available-for-sale securities, Fair value, 1,333,015 1,491,100
Residential - Government-sponsored enterprises | Fair Value, Measurements, Recurring | Level 2    
Assets    
Total available-for-sale securities, Fair value, 1,333,015 1,491,100
Commercial - Government agency    
Assets    
Total available-for-sale securities, Fair value, 267,657 387,663
Commercial - Government agency | Fair Value, Measurements, Recurring    
Assets    
Total available-for-sale securities, Fair value, 267,657 387,663
Commercial - Government agency | Fair Value, Measurements, Recurring | Level 2    
Assets    
Total available-for-sale securities, Fair value, 267,657 387,663
Commercial - Government-sponsored enterprises    
Assets    
Total available-for-sale securities, Fair value, 141,836 1,369,443
Commercial - Government-sponsored enterprises | Fair Value, Measurements, Recurring    
Assets    
Total available-for-sale securities, Fair value, 141,836 1,369,443
Commercial - Government-sponsored enterprises | Fair Value, Measurements, Recurring | Level 2    
Assets    
Total available-for-sale securities, Fair value, 141,836 1,369,443
Commercial - Non-government mortgage | Fair Value, Measurements, Recurring    
Assets    
Total available-for-sale securities, Fair value, 21,550  
Commercial - Non-government mortgage | Fair Value, Measurements, Recurring | Level 2    
Assets    
Total available-for-sale securities, Fair value, 21,550  
Government agency    
Assets    
Total available-for-sale securities, Fair value, 1,025,339 2,079,523
Government agency | Fair Value, Measurements, Recurring    
Assets    
Total available-for-sale securities, Fair value, 1,025,339 2,079,523
Government agency | Fair Value, Measurements, Recurring | Level 2    
Assets    
Total available-for-sale securities, Fair value, 1,025,339 2,079,523
Government-sponsored enterprises    
Assets    
Total available-for-sale securities, Fair value, 684,560 2,621,044
Government-sponsored enterprises | Fair Value, Measurements, Recurring    
Assets    
Total available-for-sale securities, Fair value, 684,560 2,621,044
Government-sponsored enterprises | Fair Value, Measurements, Recurring | Level 2    
Assets    
Total available-for-sale securities, Fair value, 684,560 2,621,044
Collateralized Loan Obligations | Fair Value, Measurements, Recurring    
Assets    
Total available-for-sale securities, Fair value, 246,703 105,247
Collateralized Loan Obligations | Fair Value, Measurements, Recurring | Level 2    
Assets    
Total available-for-sale securities, Fair value, $ 246,703 105,247
Debt securities issued by states and political subdivisions    
Assets    
Total available-for-sale securities, Fair value,   44,185
Debt securities issued by states and political subdivisions | Fair Value, Measurements, Recurring    
Assets    
Total available-for-sale securities, Fair value,   44,185
Debt securities issued by states and political subdivisions | Fair Value, Measurements, Recurring | Level 2    
Assets    
Total available-for-sale securities, Fair value,   $ 44,185